Great idea!! The hole is 1/4" NPT.

 

One thing to note about the IAT relocation is that it's a warm weather only mod. In the cold months the sensor reads a little "too" close to the real air temp and you end up using a lot more fuel as a result. Some guys who deal with winter keep both positions open, one guy actually had two IATs and just move the cable when the season changed. If you're in the south though should be no problem.

 

I have not experienced a drop in fuel mileage winter or summer with this mod. Gets down to the teens in winter here.

 

Maybe it's a Renix thing?

https://www.cherokeeforum.com/f59/ia...2/#post1445699
http://www.jeepforum.com/forum/f13/r...r-4-0l-738083/
https://www.cherokeeforum.com/f2/iat...90/#post490388

Haven't experimented personally, so I take this stuff at face value

 

Is there any way to get more air into the stock air box? The hole seems pretty small if I remember right. Not talking about a cold air intake because you have to run it near the windshield or whatever and I'm not doing all that.

 

Maybe. Try it. be the guinea pig.

 

Poke holes in it

 

Will that actually lead to gains in mpg etc.? I mean more air helps right? Or will there be no significant gain.

 

I luckily have a place by my girlfriend's house that actually has non-ethonal gas, and I gain a few MPG's just from that, and my XJ runs so much better on it.

IF you can find one near-by where you live, definitly fill her up. It's more pricey but totally worth it!

The one I use is in Ephrata, PA called charley's if anyones near by there!

 

I doubt there would be a vary significant gain, less then 1mpg would be my guess. Couldn't hurt though. Just don't do it on the engine side of the box that way it's colder air.

 

my jeep still needs a good tune up cap rotor plugs wires ect.. and i've been getting 20mpg on winter gas (it is a five speed) just proper tire inflation drop in filter neon injectors and better flowing exhaust mods really do help mpgs just gotta use the right foot mod with them

 

Quick intermediate update. All 4 sensors replaced with correct Denso units.

I have reset the ECU and I've put two tanks through the XJ with no deviation in mileage.

I did have to replace the passenger wheel hub/bearing, and I'm almost positive that I have a dragging caliper now on that side. I am still not convinced that the caliper would cause such a significant drop in mileage. After the bills are paid Im going to replace the driver hub, both calipers, and hoses (pads and discs i already replaced months ago).

 

Update after replacing calipers and hoses. Drives like a new one. Went in a 1200mile round trip to Tampa and got 20.1mpg down and 18.9mpg back up @ 75mph. That's loaded with 300lbs of gear and 2 girls.

Looks like my culprit was the dragging calipers. Wheels and associated hardware were not hot when I drove, but when I replaced the hub I had to pry off the caliper. That was my hint.

 

Well the important thing is you found out the problem congrats on that...

 

We recently replaced the TPS, O2 sensors and MAP with Mopar parts. I couldn't believe the numbers the last time we filled up: 23.2 mpg! Before this, we averaged 17 city/hwy.

Before you get excited about all of this, note that everything is completely stock, and every part ever replaced was OEM only. No giant tires, lift kit, funky air filters, stickers, fart mufflers, nothin'. We don't "seafoam", use special, mystical Amsoil lubricants, magic $25 spark plugs or non-spec fuel injectors.

We don't baby it either. I can easily leave 50-ft. of rubber from a stop unless I'm careful. I was very surprised to see the numbers after replacing only these input sensors; it only has 152k miles and everything worked fine --it was only preventitive maintenance, but still...23 mpg! Ha!